ANB11D-225/BU2A Yokogawa Optical ESB Bus Node Unit

Suffix Breakdown & Model Matrix

The provided model code includes the following documented configuration details:

Hardware Specifications

Process Control Signal Isolation and DCS Communication

The ANB11D-225/BU2A transfers FIO module communication data through an optical ESB Bus interface. Moreover, the optical conversion function separates long-distance communication paths from standard electrical signal wiring, reducing electromagnetic interference effects during remote I/O expansion.

Yokogawa DCS architectures commonly apply channel-to-channel isolation methods for process signal handling. Therefore, this node unit maintains electrical separation between field-level I/O modules and the remote FCU communication path while supporting dual-redundant bus operation.

The unit does not directly process analog measurement loops such as 4-20 mA HART signals. Instead, it provides the optical communication infrastructure required for Yokogawa FIO modules that perform field signal acquisition and output control.

Frequently Asked Questions

Q: Does the ANB11D-225/BU2A support redundant communication operation?
A: Yes. The unit supports a dual-redundant ESB Bus configuration and uses redundant power supply architecture with two PW482 power supply modules.

Q: What type of fiber connection does the ANB11D-225/BU2A use for remote transmission?
A: The unit uses quartz single-mode optical fiber and supports transmission distances up to 5 km according to the provided specifications.

Q: How many FIO modules can be installed with this node unit?
A: The ANB11D-225/BU2A accommodates up to 8 FIO modules within the supported rack assembly configuration.

Field Installation Guidelines

Install the ANB11D-225/BU2A in a suitable 19-inch rack structure using the specified mechanical mounting points. Ensure that the rack provides sufficient grounding continuity for the installed DCS hardware.

Route optical fiber cables separately from high-voltage power wiring and high-current motor cables to minimize mechanical damage and electromagnetic interference risks. Maintain proper fiber bending radius according to the cable manufacturer’s installation requirements.

Connect the dual AC power inputs according to the configured redundant power arrangement. Verify protective grounding, terminal tightness, and power polarity before system energization.

Before commissioning, check ESB Bus communication status, optical link indicators, and installed FIO module recognition through the CENTUM engineering environment.